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5.2. ERMUSR 02-09-2016 Elk River Municipal Utilities UTILITIES COMMISSION MEETING TO: FROM: Elk River Municipal Utilities Commission Mike O'Neill—Technical Services Superintendent John Dietz—Chair Al Nadeau—Vice Chair Daryl Thompson—Trustee MEETING DATE: AGENDA ITEM NUMBER: February 9th 2016 5.2 SUBJECT: 2015 Electric Reliability Report BACKGROUND: Minnesota Rules Chapter 7826 Public Utilities Commission Electric Utility Standards cover safety, reliability, service, and reporting requirements. Per 7826.0100(A), municipal utilities are exempt from these requirements. However, the Elk River Municipal Utilities Commission adopted a number of parts of this chapter as a Distribution Reliability Standard policy requiring annual reporting on system reliability. DISCUSSION: In 2015, our reliability index numbers remain excellent. These reliability index numbers reflect the condition of our robust electrical system as well as the superb response time from our local line crews. This also reflects the local accountability, long term visioning on system design, and ongoing system maintenance. The table below reflects the number of customer outage minutes from 2005 through 2015. Year # of Customers #of Outage Minutes #of Outages 2005 8398 558,140 59 2006 8804 314,510 73 2007 9163 67,845 47 2008 9067 155,768 57 2009 9170 46,706 49 2010 9207 526,144 77 2011 9576 297,359 51 2012 9285 71,496 57 2013 9285 55,451 31 2014 9426 243,965 44 2015 9449 225,337 41 INATURE1• Page 1of 4 Reliable Publico Power Provider P O W E R E D T O S ERV E 101 A number of reliability indexes are used in the electric industry to make it easier to compare performance of electric utilities. Listed below are the reliability indexes along with ERMU's 2014 and 2015 statistics. Also included are APPA's published averages that can be used by utilities to better understand the performance of their electric system relative to other utilities nationally and to those within their region or size class. Average Service Availability Index(ASAI) ASAI is a measure of the average availability of the sub-transmission and distribution systems to serve customers. It is the ratio of the total customer minutes that service was available to the total customer minutes available in a time period. This is normally expressed as a percentage. ERMU's 2015 ASAI is 99.9943%Availability ERMU's 2014 ASAI is 99.9945%Availability Customer Average Interruption Duration Index(CAIDI) CAIDI is defined as the average duration (in minutes)of an interruption experienced by customers during a specific time frame. It is calculated by summing the customer minutes off during each interruption in the time period and dividing this by the number of customers experiencing one or more sustained interruptions during the time period. The resulting unit is minutes. The index enables utilities to report the average duration of a customer outage for those customers affected. ERMU's 2015 CAIDI is 71.157 minutes ERMU's 2014 CAIDI is 199.883 minutes System Average Interruption Duration Index(SAID!) SAID! is defined as the average interruption duration for customers served during a specified time period. It is determined by summing the customer minutes off for each interruption during a specified time period and dividing that sum by the average number of customers served during that period. The unit is minutes. This index enables the utility to report how many minutes' customers would have been out of service if all customers were out at one time. ERMU's 2015 SAIDI is 23.723 minutes ERMU's 2014 SAIDI was 25.54 minutes System Average Interruption Frequency Index(SAIFI) SAIFI is defined as the average number of times that a customer is interrupted during a specified time period. It is determined by dividing the total number of customers interrupted in a time period by the average number of customers served. The resulting unit is"interruptions per customer." ERMU's 2015 SAIFI is 0.3 ERMU's 2014 SAIFI was 0.1428 Another statistic staff gets concerned about is the average length of any outage. Elk River Municipal Utilities' 2015 average length of outage was 134.23 minutes. In 2014 the average length of outage was 131.07 minutes. Electric utilities with a high percentage of underground facilities will exhibit higher length of outage time than electric utilities with more overhead facilities. P0WE0ED 11 Eq Page 2 of 4 NATURE Reliable Public, Power Provider P OWERED T O S ERV E 102 Staff reviews these statistics in detail to find ways to continually improve our system. These statistics are very good compared to other utilities. As indicated by the following pie chart and statistics list, you can see the cause of the outages that we experienced in 2015. squirrel 20% Other 27° Electrical'Failure Other 17% 5% '. --,41t 4t-7-0,t;,'x,,,. Lightning 5% �Zf'4 ' EquiPment 7% Vehicle Accident 1 i]96 Eq pment worn n Out 10% FouEDED D1 E4' Page 3 of 4 NATUPEReliablePublicPOWERED To SERVE Power Provider 103 Outage Cause Count View ElectiicalFalure 7_ @P 'WMteAccident 4 +l� Equipment Worn Out 4 0 17. ',*A; �� i gip. s' o$ u g 2 VP Other 2 0 Many investor owned and cooperative run utilities"storm normalize"their reliability numbers by removing"major outages"due to storms from their reliability index number calculations. Our reliability numbers have not been storm normalized. Our numbers reflect these major outages and represent what our customer actually experienced in 2015. Overall, our electric distribution system is robust and our reliability is very high. ACTION REQUESTED: No action is required. ATTACHMENT: American Public Power Association's eReliability Tracker 2015 Annual Report PyBNEAEB B1 ® NATURE Page 4 of 4 Reliable Public Power Provider P 0WE 0.E D T O S ERV E 104 eReliability I Monthly Statistics Page 1 of 5 Monthly Report Elk River Municipal Utilities Year Minimum duration Substation 2015 Month Maximum duration Circuit 12- December U Annual Report? Top-level Cause Remove Major Events? OQ Yes U O No https://reliability.publicpower.org/reports/monthly/tiblty/136?year=2015&month=12&is_a... 2/5/2016 eReliability I Monthly Statistics Page 2 of 5 IEEE 1366 Statistics Metric Current Past Average SAIDI 23.723 28.541 1.978 SAIFI 0.3 0.1 0.03 CAIDI 71.157 199.738 ASAI 99.9943% 99.9937% Momentary Interruptions 1 0 Sustained Interruptions 40 44 Circuit Ranking -Worst Performing Ranked by Customer Interruptions Circuit Substation Number of Customer Interruptions F51 Otsego 5 F55 Otsego 4 F97 ST 14-3 4 Ranked by Customer Minutes of Duration Circuit Substation Duration of Customer Interruptions F81 West 2 68,400 F71 West 1 20,745 F94 ST 14-3 10,950 https://reliability.publicpower.org/reports/monthly/4t616ty/136?year=2015&month=12&is_a... 2/5/2016 eReliability I Monthly Statistics Page 3 of 5 Monthly SAIDI Chart 12.5 Event SAIDI • 10.0 7.5 • 5.0 2.5 0.0. -.0 • Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Monthly SAIFI Chart 0.35 3Event SAIFI 0.30 0.25 0.20 0.15 0.10 0.05 •Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec https://reliability.publicpower.org/reports/monthly/vblity/136?year=2015&month=12&is_a... 2/5/2016 eReliability I Monthly Statistics Page 4 of 5 Ranked by Count Cause Count Squirrel 8 Electrical Failure 7 Vehicle Accident 4 Ranked by Duration Cause Duration Human Accident 106,830 Vehicle Accident 69,180 Equipment 20,550 https://rel iability.publicpower.org/reports/monthly/uui6iy/136?year=2015&month=l2&is_a... 2/5/2016 eReliability I Monthly Statistics Page 5 of 5 Top 10 Outages for the Year Customers Customer Minutes of Address Interrupted Duration Interruption Start Date 9509 Park Ave NE 1,187 90 106,830 11/15/2015 Otsego Elk Lake Road and 380 180 68,400 02/15/2015 Proctor Ave 191 1/2 ave. 85 90 7,650 08/23/2015 gates ave. 120 60 7,200 07/26/2015 191 1/2 ave 11951 , 20 330 6,600 08/23/2015 191 1/2 ave 11931 15 420 6,300 08/23/2015 19101 Tyler St. 23 180 4,140 07/12/2015 565 jefferson lane 25 150 3,750 07/25/2015 9527 Parrish ave st 20 165 3,300 09/26/2015 18933 Tyler St. 22 120 2,640 07/12/2015 Total Customers Affected for the Year: 3,149 Average Customers Affected per Outage: 76.804878 a/J " American eO Public Power Association 11 DEED https://reliability.publicpower.org/reports/monthly/Nty/136?year=2015&month=12&is_a... 2/5/2016